Antireflective silica coatings based on sol-gel technique with controllable pore size, density, and distribution by manipulation of inter-particle interactions using pre-functionalized particles and additives

Inactive Publication Date: 2013-02-07
INTERMOLECULAR +1
View PDF7 Cites 25 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0007]Embodiments of the invention relate generally to methods and compositions for forming porous low refractive index coatings on substrates. In one embodiment, a method of forming a porous coating on a substrate is provided. The method comprises coating a substrate with a sol-formul

Problems solved by technology

Although such antireflective coatings have been generally effective in providing reduced reflectivity over the visible spectrum, the coatings have suffered from deficiencies when used in certa

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Antireflective silica coatings based on sol-gel technique with controllable pore size, density, and distribution by manipulation of inter-particle interactions using pre-functionalized particles and additives
  • Antireflective silica coatings based on sol-gel technique with controllable pore size, density, and distribution by manipulation of inter-particle interactions using pre-functionalized particles and additives
  • Antireflective silica coatings based on sol-gel technique with controllable pore size, density, and distribution by manipulation of inter-particle interactions using pre-functionalized particles and additives

Examples

Experimental program
Comparison scheme
Effect test

examples

[0065]It is believed that the following examples further illustrate the objects and advantages of the embodiments. The particular materials and amounts thereof, as well as other conditions and details, recited in these examples should not be used to limit embodiments described herein. Unless stated otherwise all percentages, parts and ratios are by weight. Examples of the invention are numbered while comparative samples, which are not examples of the invention, are designated alphabetically.

example # 1

Example #1

[0066]A sol-formulation is prepared using tetraethylorthosilicate (TEOS) as the binder, n-propanol as the solvent, acetic acid as the catalyst, ORGANOSILICASOL™ IPA-ST-UP elongated silica particles, water, and polymethylmethacrylate (PMMA) as the inter-particle interaction modifier. The total ash content of the solution is 4% (based on equivalent weight of SiO2 produced). The ratio of silane-based binder to silica particles (TEOS:IPA-ST-UP particles) is 50:50 ash content contribution. TEOS and silica particles are mixed with water (2 times the molar TEOS amount), acetic acid (5 times the molar TEOS amount), n-propanol, and PMMA (between 0.001 wt. % and 1 wt. % of the sol-formulation). The solution is stirred for 24 hours at room temperature.

example # 2

Example #2

[0067]A sol-formulation is prepared using Tetraethylorthosilicate (TEOS) as the silane-based binder, n-propanol as the solvent, acetic acid as the catalyst, ORGANOSILICASOL™ IPA-ST-UP elongated silica particles, water, and dextrin as the inter-particle interaction modifier. The total ash content of the solution is 4% (based on equivalent weight of SiO2 produced). The ratio of silane-based binder to silica particles (TEOS:IPA-ST-UP particles) is 50:50 ash content contribution. TEOS and silica particles are mixed with water (2 times the molar TEOS amount), acetic acid (5 times the molar TEOS amount), n-propanol, and dextrin (between 0.001 wt. % and 1 wt. %). The solution is mixed at room temperature and stirred for 24 hours at 60 degrees Celsius.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
Pore sizeaaaaaaaaaa
Forceaaaaaaaaaa
Densityaaaaaaaaaa
Login to view more

Abstract

Methods and compositions for forming durable porous low refractive index coatings on substrates are provided. In one embodiment, a method of forming a porous coating on a substrate is provided. The method comprises coating a substrate with a sol-formulation comprising a silane-based binder, silica-based nanoparticles, and an inter-particle interaction modifier for regulating interactions between the silica-based nanoparticles and annealing the coated substrate. Porous coatings formed according to the embodiments described herein demonstrate good optical properties (e.g., a low refractive index) while maintaining good mechanical durability due to the presence of the inter-particle interaction modifier. The inter-particle interaction modifier increases the strength of the particle network countering capillary forces produced during drying to maintain the porosity structure.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]Embodiments of the invention relate generally to methods and compositions for forming porous low refractive index coatings on substrates.[0003]2. Description of the Related Art[0004]Coatings that provide low reflectivity or a high percent transmission over a broad wavelength range of light are desirable in many applications including semiconductor device manufacturing, solar cell manufacturing, glass manufacturing, and energy cell manufacturing. The transmission of light through a material causes the wavelength of the light to change, a process known as refraction, while the frequency remains unchanged thus changing the speed of light in the material. The refractive index of a material is a measure of the speed of light in that material which is generally expressed as a ratio of the speed of light in vacuum relative to that in the material. Low reflectivity coatings generally have an optimized refractive index (n) in be...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): B05D5/06G02B5/22
CPCB05D5/06C08L83/04C09D183/04C03C17/009C03C2217/425C03C2217/732C03C2218/113C23C18/00
Inventor KUMAR, NITINKALYANKAR, NIKHIL D.SUN, ZHI-WEN
Owner INTERMOLECULAR
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap